We used Sigma Solve to create our eCommerce website and to perform SEO on two websites. On the website, they delivered the finished product on time, and they have responded quickly every time that we decide to make changes to the site.
I have been very pleased with the SEO work. You could not find either one of my companies on a Google search. Now we pop up on the first page on a variety of searches using Google, Bing, or Yahoo. Oftentimes, we are the #1 or #2 non-advertising hit.